Considering nearly every pedestrian walking along the streets near me at night is wearing dark clothes (and there are typically no sidewalks) that's a terrifying statement.
It's a similar thing to not being able to see men carrying a glass windowpane. It's a somewhat niche problem.
Parked cars, on the other hand, may be a tougher challenge. If I were building a self-driving car, my nightmare scenario would probably be a tire lying in the middle of the road, or a piece of matte-textured furniture.
I honked the horn at it.
Thankfully, it missed me despite that brilliant decision.
Matte black cars, not so much.